<template>
    <div id="login">
        <div id="bgd">
            <canvas id='myCanvas' :width='width' :height='height'>
            </canvas>
        </div>
        <div id="loginBox">
            <div class="g_pic" align="center">
                <img src="../assets/专利.png" />
            </div>
            <el-form ref="UserFormRef" :model="UserForm" :rules="UserRules" class="user_form" label-width="0px">
                <el-form-item prop="name" class="inps">
                    <el-input v-model="UserForm.username" prefix-icon="iconfont icon-yonghu"></el-input>
                    <span id="nameInfo"></span>
                </el-form-item>
                <el-form-item prop="password" class="inps">
                    <el-input type="password" v-model.number="UserForm.password" prefix-icon="iconfont icon-mima"></el-input>
                    <span id="numberInfo"></span>
                </el-form-item>

                <el-form-item class="btns" align="center">
                    <el-button type="primary" class="submitBtn" @click="Login()">登录</el-button>
                    <el-button type="info" class="submitBtn" @click="resetForm()">重置</el-button>
                </el-form-item>
            </el-form>
            <el-link :underline="false" href="/#/AdminLogin">管理员登录</el-link>
        </div>
    </div>
</template>

<script>
    export default {
        data() {
            return {
                canvas: null,
                context: null,
                stars: [], //星星数组
                shadowColorList: [
                    "#00ffa6",
                    "#ec5707",
                    "#f3f3f3",
                    "#22e6c7",
                    "#9bf306",
                    "#0800ff",
                    "#bb546a"
                ], //阴影颜色列表
                directionList: ["leftTop", "leftBottom", "rightTop", "rightBottom"], //星星运行方向
                speed: 12, //星星运行速度
                last_star_created_time: new Date(), //上次重绘星星时间
                Ball: class Ball {
                    constructor(radius) {
                        this.x = 0;
                        this.y = 0;
                        this.radius = radius;
                        this.color = "";
                        this.shadowColor = "";
                        this.direction = "";
                    }

                    draw(context) {
                        context.save();
                        context.translate(this.x, this.y);
                        context.lineWidth = this.lineWidth;
                        var my_gradient = context.createLinearGradient(0, 0, 0, 8);
                        my_gradient.addColorStop(0, this.color);
                        my_gradient.addColorStop(1, this.shadowColor);
                        context.fillStyle = my_gradient;
                        context.beginPath();
                        context.arc(0, 0, this.radius, 0, Math.PI * 2, true);
                        context.closePath();

                        context.shadowColor = this.shadowColor;
                        context.shadowOffsetX = 0;
                        context.shadowOffsetY = 0;
                        context.shadowBlur = 10;

                        context.fill();
                        context.restore();
                    }
                }, //工厂模式定义Ball类
                width: window.innerWidth,
                height: window.innerHeight,
                UserForm: {
                    /*name: "用户名",
                    number: "密码",*/
                    username: "admin",
                    password: "123456",
                },
                UserRules: {
                    username: [{
                        required: true,
                        message: '用户名为必填项',
                        trigger: 'blur'
                    },
                        {
                            min: 2,
                            max: 8,
                            message: '长度在 2 到 8 个字符',
                            trigger: 'blur'
                        }
                    ],
                    password: [{
                        required: true,
                        message: '密码为必填项',
                        trigger: 'blur'
                    }, ],
                }
            };
        },
        methods: {
            resetForm() {
                this.$refs.UserFormRef.resetFields()
            },

            Login() {
                this.$refs.UserFormRef.validate(async valid => {
                    console.log(this.UserForm);
                    console.log(this.UserForm.username);
                    console.log(valid);
                    if(!valid) return;


                    window.sessionStorage.setItem('username', this.UserForm.username);
                    window.sessionStorage.setItem('password', this.UserForm.password);
                    await this.$router.push({path: "/home"});
                    /*await this.$router.push({path: "/home"});*/

                    const{data:res}= await this.$http.post("login",this.UserForm);
                    console.log(res);
                    /*if(res.flag=="ok"){
                        window.sessionStorage.setItem('username', this.UserForm.username);
                        window.sessionStorage.setItem('password', this.UserForm.password);
                        this.$message.success("成功");
                        await this.$router.push({path: "/home"});
                        console.log(res.users);
                    }else{
                        this.$message.error("失败");
                    }*/
                })
            },


            //提交登录
            submitForm() {},
            //重复动画
            drawFrame() {
                let animation = requestAnimationFrame(this.drawFrame);
                this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
                this.createStar(false);
                this.stars.forEach(this.moveStar);
            },
            //展示所有的星星
            createStar(params) {
                let now = new Date();
                if (params) {
                    //初始化星星
                    for (var i = 0; i < 50; i++) {
                        const radius = Math.random() * 3 + 2;
                        let star = new this.Ball(radius);
                        star.x = Math.random() * this.canvas.width + 1;
                        star.y = Math.random() * this.canvas.height + 1;
                        star.color = "#ffffff";
                        star.shadowColor = this.shadowColorList[
                            Math.floor(Math.random() * this.shadowColorList.length)
                            ];
                        star.direction = this.directionList[
                            Math.floor(Math.random() * this.directionList.length)
                            ];
                        this.stars.push(star);
                    }
                } else if (!params && now - this.last_star_created_time > 1000) {
                    //每隔3秒重绘修改颜色其中30个球阴影颜色
                    for (var i = 0; i < 30; i++) {
                        this.stars[i].shadowColor = this.shadowColorList[
                            Math.floor(Math.random() * this.shadowColorList.length)
                            ];
                    }
                    this.last_star_created_time = now;
                }
            },
            //移动
            moveStar(star, index) {
                if (star.y - this.canvas.height > 0) {
                    //触底
                    if (Math.floor(Math.random() * 2) === 1) {
                        star.direction = "leftTop";
                    } else {
                        star.direction = "rightTop";
                    }
                } else if (star.y < 2) {
                    //触顶
                    if (Math.floor(Math.random() * 2) === 1) {
                        star.direction = "rightBottom";
                    } else {
                        star.direction = "leftBottom";
                    }
                } else if (star.x < 2) {
                    //左边
                    if (Math.floor(Math.random() * 2) === 1) {
                        star.direction = "rightTop";
                    } else {
                        star.direction = "rightBottom";
                    }
                } else if (star.x - this.canvas.width > 0) {
                    //右边
                    if (Math.floor(Math.random() * 2) === 1) {
                        star.direction = "leftBottom";
                    } else {
                        star.direction = "leftTop";
                    }
                }
                if (star.direction === "leftTop") {
                    star.y -= star.radius / this.speed;
                    star.x -= star.radius / this.speed;
                } else if (star.direction === "rightBottom") {
                    star.y += star.radius / this.speed;
                    star.x += star.radius / this.speed;
                } else if (star.direction === "leftBottom") {
                    star.y += star.radius / this.speed;
                    star.x -= star.radius / this.speed;
                } else if (star.direction === "rightTop") {
                    star.y -= star.radius / this.speed;
                    star.x += star.radius / this.speed;
                }
                star.draw(this.context);
            }
        },
        mounted() {
            this.canvas = document.getElementById("myCanvas");
            this.context = this.canvas.getContext("2d");

            this.createStar(true);
            this.drawFrame();
        }
    };
</script>

<style lang='less' scoped>
    #login {
        width: 100vw;
        padding: 0;
        margin: 0;
        height: 100vh;
        font-size: 16px;
        background-repeat: no-repeat;
        background-position: left top;
        background-color: #242645;
        color: #fff;
        font-family: "Source Sans Pro";
        background-size: 100%;
        background-image: url(../assets/背景.png);
        position: relative;

        #bgd {
            height: 100vh;
            width: 100vw;
            overflow: hidden;
        }

        #loginBox {
            width: 400px;
            height: 280px;
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            margin: auto;
            padding: 50px 40px 40px 40px;
            box-shadow: -15px 15px 15px rgba(6, 17, 47, 0.7);
            opacity: 1;
            background: linear-gradient(230deg,
            rgba(53, 57, 74, 0) 0%,
            rgb(0, 0, 0) 100%);
            /deep/ .inps input {
                border: none;
                color: #fff;
                background-color: transparent;
                font-size: 18px;
            }
            .submitBtn {
                background-color: transparent;
                color: #39f;
                width: 100px;
            }
            .iconfont {
                color: #fff;
            }
        }
    }
    .user_form {
        padding: 0 20px;
    }
    .el-link{
        padding-left: 82%;
    }
</style>
